Extraction of silver into nitrobenzene using cesium dicarbollylcobaltate in the presence of 18-crown-6 |
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Authors: | E. Makrlík P. Vaňura |
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Affiliation: | (1) Institute of Physical Engineering, University of West Bohemia, Veleslavínova 11, 301 14 Pilsen, Czech Republic;(2) Department of Analytical Chemistry, Prague Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic |
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Abstract: | From several cesium distribution experiments with 134 Cs tracer, the exchange extraction constant corresponding to the equilibrium Ag+ (aq)+CsL+ (nb) AgL+ (nb)+Cs+ (aq) in the two-phase water-nitrobenzene system (L = 18-crown-6; aq = aqueous phase, nb = nitrobenzene phase) was determined as log Kex (Ag+ ,CsL+ ) = -0.6±0.1. Furthermore, the stability constant of the silver — 18-crown-6 complex in nitrobenzene saturated with water was evaluated for a temperature of 25 °C: log nb (AgL+ ) = 8.2±0.1. Finally, the individual extraction constant of the species AgL+ in the water-nitrobenzene system corresponding to the equilibrium AgL+ (aq) AgL+ (nb) was calculated: KAgL+ = O1.2±0.1. |
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